cd $1
# $2=1-fjwe九佛额.jpg
# 错误的脚本：
# $2=1-fjwe九\\ 佛额.jpg ==> 已保存 “1-fjwe九\\”
# wget -O ($2) $3 ==> syntax error near unexpected token `('
# wget -O $(2) $3 ==> 2: command not found
wget -O $2 $3